Have you just noticed that your water heater is leaking? We know—it’s not a fun sight, and it can be stressful to deal with. You want answers, you’re worried about what it’ll cost, and you need to know if it’s something serious. The good news is, you’re in the right place. Keep reading this blog from America’s Plumbing Company to learn why your water heater is leaking, what you can do about it right now, and what steps come next to get your home back to normal.
Is the Water Heater Dripping or Leaking? There’s a Difference
Not every drip means disaster—but it’s important to know the difference between a harmless drip and a true water heater leak. A light drip, a little steam, or some moisture near the base might just be harmless condensation that forms when cold water meets the warm tank surface, especially during Sacramento’s cooler months.
However, a steady leak or a small puddle that keeps growing usually means something inside or around your tank water heater is failing—like the temperature pressure relief valve, drain valve, or even corrosion eating through the tank itself, which is absolutely the worst-case scenario.
Can I Still Use My Water Heater If It’s Leaking?
It’s not a good idea. Continuing to use a leaking water heater can make the problem worse, especially if the leak is coming from inside the tank or a failing safety mechanism. Water can reach the power supply on electric water heaters or the gas supply on gas water heaters, which can be dangerous.
If your system is actively leaking right now, shut off the water and contact a plumber right away. A quick water heater repair can often stop the problem before it turns into major damage or the need for a full replacement.
Where Is the Water Heater Leaking From?
When a water heater is leaking, water can escape from several different spots—and each one tells a different story about what’s going wrong. Leaks can come from the top of the tank, where fittings and the temperature pressure relief valve connect; from the sides, where the water supply lines or drain valve are located; or from the bottom, where corrosion or internal tank failure often start. Knowing where the water is coming from matters because each area carries its own risks.
Water Heater Wet at Bottom
If you notice a puddle under your water heater, the leak is coming from the lower portion of the tank or one of its components. You may see water forming around the base, dripping from the drain valve, or collecting beneath the insulation. Leaks at the bottom are often more serious than those at the top because they can indicate internal damage or corrosion that may eventually cause the tank to burst. Once that happens, the water heater can release gallons of water in a short time.
Water heaters leak from the bottom because of:
- Loose or Faulty Drain Valve: The drain valve used for maintenance can loosen or crack with age. If the lever doesn’t close tightly or the threads are worn, water will slowly leak from the bottom of the unit. In most cases, tightening or replacing the valve will stop the leak.
- Corrosion Inside the Tank: Over time, sediment buildup and minerals react with the metal interior, causing corrosion that weakens the tank wall. Once the lining fails, water begins escaping through small holes, and the only solution is a full water heater replacement.
- Excess Discharge from the Temperature Pressure Relief Valve: When there’s too much pressure or the temperature is set too high, the valve can open and release water through the discharge pipe near the base. A plumber will check system pressure, confirm the thermostat is set correctly, and replace the valve if it’s malfunctioning.
- Cracked Tank or Internal Seal Failure: Continuous heating and cooling cycles place stress on the tank materials, leading to fractures or failed seams that allow water leakage from the bottom. If this occurs, the tank can’t be safely repaired and must be replaced to prevent a burst or sudden flooding.
If your water heater is leaking from the bottom, call a professional immediately. Bottom leaks can get worse quickly as pressure keeps pushing water through the damaged spot.
While you wait, turn off the power to the unit—use the breaker for electric water heaters or switch the gas control valve to “off” for gas water heaters. Next, shut off the cold water supply, which is the valve located on the pipe entering the top of the tank. Then, place towels or a bucket around the base to catch any remaining water and keep it from spreading.
Water Heater Leaking from Top
If you see water pooling on the top of your hot water heater or dripping down the sides, the leak is likely coming from one of the upper connections. Check around the water supply lines and the temperature pressure relief valve—these are common problem areas. You may notice a slow, steady drip, condensation that doesn’t dry up, or moisture collecting around fittings. Even small leaks in this area can lead to corrosion or electrical hazards.
Water heaters often leak from the top because of:
- Loose Water Supply Connections: The fittings where cold water enters and hot water exits the tank can loosen over time from thermal expansion or vibration. Tightening or resealing them usually stops the leak.
- Faulty Temperature Pressure Relief Valve: This safety mechanism releases water when pressure or temperature gets too high. If it’s set incorrectly, clogged, or damaged, it can leak continuously and should be replaced.
- Corroded Pipe Fittings: Corrosion from hard water or age can cause pinhole leaks where the water supply lines connect to the tank. These parts may need to be cleaned or replaced.
- Cracked or Worn Gaskets: The gaskets sealing the temperature pressure relief valve or other fittings can dry out, crack, or deteriorate, allowing water to escape. Replacing them restores a watertight seal.
Most leaks from the top of a water heater can be handled with a repair. But if there’s visible rust, heavy corrosion, or your unit is 10+ years old, a full replacement may be recommended.
Water Heater Leaking from Side Panel
If you see water seeping from the side panel of your water heater, dripping along the casing, or notice damp insulation behind the cover, the leak is likely coming from a component mounted inside the tank wall. You may also hear a faint hiss or see rust forming around the access area.
A water heater leaking from the side often means:
- Worn Heating Element Gasket: On electric water heaters, the gasket sealing the heating element can deteriorate with age, allowing water to escape through the side panel. Replacing the gasket or element restores a tight seal.
- Leaking Temperature Pressure Relief Valve: If the temperature pressure relief valve is installed on the side, excess pressure or incorrect temperature settings can cause it to discharge water. The valve should be inspected, adjusted, or replaced as needed.
- Condensation Inside the Housing: When cold water enters a hot tank, condensation can collect and drain out through seams or openings. Occasional moisture is normal, but persistent water indicates a mechanical leak.
- Corrosion or Internal Crack: If water is leaking directly through the side of the water tank, internal corrosion or a crack in the metal is likely the cause. This cannot be repaired and requires a new water heater.
Most leaking water heaters are caused by years of regular use, internal wear, or a poor water heater installation that left fittings or valves under strain. You need a licensed professional who can make the necessary repairs or handle your replacement quickly.
How Much Does it Cost to Fix a Leaking Water Heater?
The cost to fix a leaking water heater depends on where the problem starts and how severe it is. Simple issues like tightening fittings, replacing a drain valve, or adjusting the temperature pressure relief valve are typically quick, affordable repairs. But leaks caused by corrosion, internal cracks, or a failing tank are costly repairs that usually mean it’s time for a full replacement.
Schedule a Same-Day Water Heater Repair with America’s Plumbing Company
America’s Plumbing Company has an expert team of skilled technicians ready to fix your water heater now. We repair both gas heaters and electric heaters, with same-day water heater repairs in Sacramento, CA, and the surrounding area. Emergency water heater repairs and replacements are available because we know what’s at risk—your home, your water heater, and the costly water damage that can come from waiting too long. Our local water heater company has been in Sacramento since 1999. Customers know us for our fast service and fair prices.
For the water heater repair Sacramento trusts, choose America’s Plumbing Company. Call now and get a real person on the phone!